I brought a used set of spider gears and cross off of fleabay and they look very rough including the cross. However, I mainly wanted the cross although it still has a lot of wear.The tractor that it came from definitely had some dirty fluid in it. However, I wanted to ask about some damage on the differential. Look at the photos; do you think it will be OK if I clean the area up with a dremel tool? The hole you see is where the broken cross arm came from.